Chess Opening Theory/1. e4/1...e5/2. Nf3/2...d6/3. d4/3...Nd7/4. Bc4

4.Bc4
This tries to exploit f7. Now Black must be very cautious. There are tons of traps lurking. The natural Be7?, and Ngf6? all lose forcefully. The best move is 3..exd4 and then only followed by Ngf6, with a solid but passive position for black. Also, the awkward Ne7?? should be avoided. White is a bit better, but Black can still fight for everything.

Theory Table
Bibliography


 * Kaufman, Larry (2004). The Chess Advantage in Black and White. ISBN 0-8129-3571-3.
 * Panov, Vasily (1973). Teoría de Aperturas, Tomo I: Aperturas Abiertas - Aperturas Semiabiertas. ISBN 84-270-0132-0.
 * Schiller, Eric (2002). Standard Chess Openings. ISBN 1-58042-048-6.